1982 Freightliner COE...

Go back to when you smelled the wires burning was there any extra racket going on, I think the starter may have hung up and kept spinning with the motor running making that smell.

 

If the bendix failed to release it's gone for sure.

The selenoid would take a rap of a hammer first if it was me before anything. The old mack Selenoids actually could take a bic pen rammed from below to crank... I don't recall enough of the cabover, lord knows I spent part my life in and under those things... to be certain.

 

that suggests the ignition switch failed,leaving the circuit to the solenoid for fuel shutoff energized. or melted and energized via a different circuit. did you say the batteries were running dead on you too?

 

When the truck raced at the stop sign, are you sure it's not a typical unloading behavior of a engine whose clutch is just depressed?

Do you understand what I am asking exactly?

 

Hm. I hear you. Im still stuck on that problem. Either you had a spike electric power on the fuel pump orsomething else. But trucks generally don't spike. They drain.

 

Just wait till you get starter working before you send the inj. pump off to get rebuilt you do not want too have it to far apart?